ECONOMIC VALUE OF FUMIGATION 237 
fruit. It would appear, therefore, that dropping the 
leaves from the trees is not so apt to work injury to 
the orange in Florida as in California. We fumigated 
trees of various sizes from mere bushes up to 30 
feet in hight and 25 feet in diameter, using various 
styles of tents. The hoop tent proved most satis- 
factory for trees not over 12 feet in hight and of 
equal diameter, but for larger trees we used the bell 
tent, handling it by means of a new form of derrick. 
We ceased fumigation work when the trees com- 
menced to blossom freely, and put the tents away. 
‘« Several hundred trees were fumigated, and four or 
five times as many sprayed with resin wash and with 
a few other materials for comparison. The gasmethod 
is the more expensive to begin with, but we are inclined 
to believe it may be the cheapest in the end. I found 
that about seventy-five per cent. of the insects were 
killed by a single spraying with resin wash, but in 
examining thousands of insects upon many different 
trees that were fumigated I was able to find but a 
single living representative. I have nodoubt that the 
practical application of the process to two or three of 
our orange-growing counties will mean a net profit of 
$250,000 to $500,000 annually inside of three or four 
years, if the treatment is generally adopted. We have 
not worked with deciduous trees, not because we 
believe it impracticable, but for lack of time up to the 
present. A number of our nurserymen use the gas in 
fumigating their nursery stock, and in a more limited 
way plants and shrubs, upon their premises. Nearly 
all of our nurserymen doing a large and extensive 
business have excellent fumigating appliances. 
